汶川地震断裂带科学钻探项目WFSD-3-P孔钻探施工概况

Situation of WFSD-3-P Drilling Operation of Wenchuan Earthquake Fault Scientific Drilling Project

摘要:

主要介绍了汶川地震断裂带科学钻探项目WFSD-3-P孔的地层情况、施工过程、钻井液技术、事故的处理与预防技术。在钻探施工中，采取了高密度低失水泥浆体系和反复扫孔、起钻中途回灌泥浆的措施，解决了断层泥缩径、岩层破碎、钻孔坍塌扩径的技术难题，并取得了原状性完好的岩心。

Abstract:

This article introduces the drilling process of WFSD-3-P of Wenchuan earthquake fault scientific drilling (WFSD) project. A series of technical measures of high-density and low-filtration drilling fluid system, repeated reaming and mud recharging in pipe trip were taken to overcome drilling difficulties, such as borehole shrinkage in fault gouge formation, rock breaking and collapsed borehole enlarging. As the result, high quality undisturbed cores have been obtained and rich drilling experiences in earthquake fault have been accumulated.